alt Hacker NewsI think with arch wiki it is even more than that. Before I switched to arch back then, you would consult the arch wiki for an unrelated distro, because it was (is) that good. Even the aur repository helps you alot, by checking the raw scripts, how to compile stuff. I can't make a good example but it feeled like reading vi specific wiki that helped you with plugin development for emacs.
AUR is particularly useful because Arch has really simple build scripts. They are bash with some particular function names that you need to define (like "build" and "check") and a few bits of package metadata in variables. Pretty intelligible even if you don't know the format beforehand.
Contrast that with Debian build scripts which I never managed to figure out. It's dozens of layers of helpers for "common cases" with lots of Makefile magic. Completely inscrutable if you aren't already a Debian package maintainer. Very compact though.